Jkp Constable Telecommunication Telecommunication Mcqs Jkp Constable (1089 MCQs) | JKSSB & SSC Quiz

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Practice Questions

1089 Total
Question 51 Discuss
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In a magnetic circuit, what is the analog of electrical resistance?

A
Permeance
B
Reluctance
C
Magnetomotive force
D
Flux density

Answer & Explanation

Correct Option: B

Reluctance opposes the establishment of magnetic flux, just as resistance opposes the flow of electric current.
Question 52 Discuss
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According to Steinmetz's formula, hysteresis loss in a magnetic material depends heavily on:

A
Only the frequency of reversal
B
Maximum flux density and frequency
C
Only the volume of the material
D
The conductivity of the material

Answer & Explanation

Correct Option: B

Steinmetz's equation is Ph = K * f * (Bmax)^n * V, highlighting dependence on frequency and maximum flux density.
Question 53 Discuss
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What happens to a ferromagnetic material when it is heated above its Curie temperature?

A
It becomes superconducting
B
It becomes completely diamagnetic
C
It loses its ferromagnetism and becomes paramagnetic
D
Its permeability becomes infinite

Answer & Explanation

Correct Option: C

Thermal agitation destroys the magnetic domain alignments, transitioning the material from ferromagnetic to paramagnetic.
Question 54 Discuss
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What is the primary function of an RCCB (Residual Current Circuit Breaker) in domestic wiring?

A
Protecting against short circuits
B
Protecting against severe overloads
C
Protecting humans from fatal electric shocks due to earth leakage
D
Stabilizing voltage fluctuations

Answer & Explanation

Correct Option: C

RCCBs detect minute imbalances between live and neutral currents (leakage to earth) and trip quickly to prevent electrocution.
Question 55 Discuss
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A Megger is specifically designed and used to measure:

A
High insulation resistance
B
Very low ground resistance
C
High AC voltages
D
Inductance of large coils

Answer & Explanation

Correct Option: A

A Megger generates a high DC voltage to measure the extremely high insulation resistance of cables and windings.
Question 56 Discuss
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For a large electrical substation, the ideal earth resistance value should be:

A
Less than 1 ohm
B
Around 5 ohms
C
Between 10 and 20 ohms
D
More than 50 ohms

Answer & Explanation

Correct Option: A

To safely dissipate high fault currents, large substations require an earth resistance of strictly less than 1 ohm.
Question 57 Discuss
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The area enclosed by the B-H curve of a magnetic material represents:

A
Permeability of the material
B
Reluctance of the core
C
Hysteresis loss per unit volume per cycle
D
Eddy current loss

Answer & Explanation

Correct Option: C

The B-H loop area directly corresponds to the energy dissipated as heat during each cycle of magnetization and demagnetization.
Question 58 Discuss
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Which physical principle is utilized in clip-on current meters (tong testers) for measuring DC currents?

A
Electromagnetic induction
B
Hall effect
C
Seebeck effect
D
Piezoelectric effect

Answer & Explanation

Correct Option: B

DC cannot induce current via transformer action, so Hall effect sensors detect the static magnetic field created by the DC current.
Question 59 Discuss
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A wiring installation has a minimum required insulation resistance limit. If more appliances are connected in parallel, the total insulation resistance of the installation:

A
Increases
B
Decreases
C
Remains constant
D
Becomes zero

Answer & Explanation

Correct Option: B

Insulation paths act as high-value resistors in parallel with ground. Adding more paths (appliances) decreases the overall parallel resistance.
Question 60 Discuss
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What happens if the test button on an Earth Leakage Circuit Breaker (ELCB) is pressed?

A
It creates an artificial short circuit
B
It injects a fault current to unbalance the sensing coil, causing it to trip
C
It bypasses the main breaker
D
It measures the earth resistance

Answer & Explanation

Correct Option: B

The test button simulates a leakage fault by creating an imbalance in the sense coils, verifying the mechanical trip mechanism works.
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